8.4.2 Meaning of the jumpers
Jumpers P1, P2 and P3 are located inside the front opening of the cover. See table 7 for
installation guide.
• Jumper P1 adds a 510 ohm polarization resistance between the negative data line (-)
and GND
• Jumper P2 adds a 120 ohm terminal resistance between the two data lines (+) and (-);
• Jumper P3 adds a 510 ohm polarization resistance between the positive data line (+) and
the +5 VDC internal voltage.
Insert all three jumpers on the unit at the start of network and the unit at the end of the
network. Do not insert the jumpers on the intermediate units. For compliance of the product
with the European EMC standards, add the ferrite supplied to the network cable, as illustrated
in Table 7.
8.4.3 Operation
The Status LED (left) indicates the status of communication with the controller and the status of
the PCOnet.
Starting sequence: on power-up, or after restarting PCOnet, the Status LED switches in the
following sequence:
• OFF for 2 seconds;
• 2 seconds after restarting: quick flash red-green-red-green
• 5 seconds after restarting: green on steady
• Approximately 50 seconds after restarting: flashing (color: see below - Status of
communication with the controller) PCOnet-pCO* communication starts.
Status of communication with the controller: Once the starting sequence has been completed,
the Status LED flashes to indicate the quality of communication with the controller:
• Quick green-OFF-green if communication with the controller is OK (pCO* ON-LINE);
• Slow red-OFF-red if communication has not been established with the pCO* (controller
OFF-LINE)
• Green-red-green if PCOnet detects errors or a temporary lack of response from the
controller.
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